Re: JSONSerialization 'Garbage at end' error
Re: JSONSerialization 'Garbage at end' error
- Subject: Re: JSONSerialization 'Garbage at end' error
- From: Jens Alfke <email@hidden>
- Date: Wed, 30 Apr 2014 16:30:43 -0700
On Apr 30, 2014, at 4:00 PM, Jonathan Hull <email@hidden> wrote:
> I also find that it is good practice to set variables returned by reference to nil before passing them.
> NSError *error = nil;
> Otherwise, they will contain garbage, and cannot reliably be tested to see if the value was set.
That’s still not a good idea. If the call succeeds, it’s not guaranteed that the error value is unchanged. It might have been set to some intermediate error value, for example.
If the call failed, the error will contain a valid value whether or not you initialized the variable, so there’s no need to initialize it.
tl;dr: NEVER use the error value to determine whether or not the call succeeded. Use the return value for that. Only look at the error if the return value told you the call failed.
—Jens
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